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Detection of interstellar hydrogen peroxide

Per Bergman (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; B. Parise ; René Liseau (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; B. Larsson ; Hans Olofsson (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; K. M. Menten ; R. Güsten
Astronomy and Astrophysics (0004-6361). Vol. 531 (2011), p. L8.
[Artikel, refereegranskad vetenskaplig]

Context. The molecular species hydrogen peroxide, HOOH, is likely to be a key ingredient in the oxygen and water chemistry in the interstellar medium. Aims. Our aim with this investigation is to determine how abundant HOOH is in the cloud core ρ Oph A. Methods. By observing several transitions of HOOH in the (sub)millimeter regime we seek to identify the molecule and also to determine the excitation conditions through a multilevel excitation analysis. Results. We have detected three spectral lines toward the SM1 position of ρ Oph A at velocity-corrected frequencies that coincide very closely with those measured from laboratory spectroscopy of HOOH. A fourth line was detected at the 4σ level. We also found through mapping observations that the HOOH emission extends (about 0.05 pc) over the densest part of the ρ Oph A cloud core. We derive an abundance of HOOH relative to that of H2 in the SM1 core of about 1 × 10-10. Conclusions. To our knowledge, this is the first reported detection of HOOH in the interstellar medium.



Denna post skapades 2011-06-20. Senast ändrad 2015-06-23.
CPL Pubid: 141987

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)
Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi
Galaktisk astronomi

Chalmers infrastruktur